Ideas on how to make a new beauty/cosmetology salon better/more succesfull from the begining

Hi,

My GF is preparing to open her own beauty salon. Nails, face acids (yes, that's a thing, I was surprised as well), skin treatments, massages and so on. Everything related to cosmetology stuff.

She will start alone but the goal is to hire 2 ppl in the future.

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My question is: Do you have any ideas how to make it better than the rest/more succesfull?

I mean ideas like: Put a TV in the waiting room with slide show showing effects of some skin treatments, which may encourage women waiting for her nails to buy additional services.

Maybe a better way to advertise/how to advertise and where?

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Maybe some kick ass products/services that your women saw somewhere and now is sticking to this one place?